 import {mapGetters} from 'vuex'
export default {
 computed:{
   ...mapGetters('m_cart',['total'])
 },
 watch:{
   total(){
     this.getBadage()
   }
 },
 onShow() {
   this.getBadage()
 },
 methods:{
   getBadage(){
     uni.setTabBarBadge({
       index:2,
       text:this.total+''
     })
   }
 }
}